A man sustained cuts to his head and arm and needed stitches after being attacked by a man wielding a knife and a crow bar.
The man in his 30s was approached by the suspect in Epping High Street on Tuesday August 15 between 9.30pm and 10.30pm.
The victim did not require hospital treatment.
Essex Police are treating the incident as isolated and say there is no further threat to the wider public.
The suspect is described as a mixed race man in his 20s, around 5ft 10ins tall and of slim build.
Anyone who witnessed the assault or who may have information about the suspect is asked to contact DC Ben Elliott at Loughton Criminal Investigation Department on 101.
To give information anonymously contact Crimestoppers on 0800 555 111.
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